diff --git a/.travis.yml b/.travis.yml
index 581420c..9add64c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@ gemfile:
   - gemfiles/rails507.gemfile
   - gemfiles/rails516.gemfile
   - gemfiles/rails521.gemfile
+  - gemfiles/rails522.gemfile
 matrix:
   exclude:
   - rvm: 2.1.9
@@ -23,3 +24,5 @@ matrix:
     gemfile: gemfiles/rails4252.gemfile
   - rvm: 2.4.2
     gemfile: gemfiles/rails4271.gemfile
+  - rvm: 2.1.9
+    gemfile: gemfiles/rails522.gemfile
diff --git a/Appraisals b/Appraisals
index 8766cb2..c65aec3 100644
--- a/Appraisals
+++ b/Appraisals
@@ -28,6 +28,12 @@ when '2.3.3' then
     gem 'rails-controller-testing'
   end
 
+  appraise 'rails522' do
+    gem 'rails', '5.2.2'
+    gem 'grape', '1.1.0'
+    gem 'rails-controller-testing'
+  end
+
 else
   raise "Unsupported Ruby version #{RUBY_VERSION}"
 
diff --git a/gemfiles/rails507.gemfile b/gemfiles/rails507.gemfile
index a684b25..b3bc3ba 100644
--- a/gemfiles/rails507.gemfile
+++ b/gemfiles/rails507.gemfile
@@ -6,7 +6,7 @@ gem "appraisal", "~> 2.1"
 gem "mocha", "~> 1.0", require: false
 gem "sqlite3"
 gem "rails", "5.0.7"
+gem "grape", "1.1.0"
 gem "rails-controller-testing"
-gem 'grape', "1.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails516.gemfile b/gemfiles/rails516.gemfile
index aea7c37..e5169a4 100644
--- a/gemfiles/rails516.gemfile
+++ b/gemfiles/rails516.gemfile
@@ -6,7 +6,7 @@ gem "appraisal", "~> 2.1"
 gem "mocha", "~> 1.0", require: false
 gem "sqlite3"
 gem "rails", "5.1.6"
+gem "grape", "1.1.0"
 gem "rails-controller-testing"
-gem 'grape', "1.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails521.gemfile b/gemfiles/rails521.gemfile
index b9e9853..f8490b5 100644
--- a/gemfiles/rails521.gemfile
+++ b/gemfiles/rails521.gemfile
@@ -6,7 +6,7 @@ gem "appraisal", "~> 2.1"
 gem "mocha", "~> 1.0", require: false
 gem "sqlite3"
 gem "rails", "5.2.1"
+gem "grape", "1.1.0"
 gem "rails-controller-testing"
-gem 'grape', "1.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails522.gemfile b/gemfiles/rails522.gemfile
new file mode 100644
index 0000000..41f03dc
--- /dev/null
+++ b/gemfiles/rails522.gemfile
@@ -0,0 +1,12 @@
+# This file was generated by Appraisal
+
+source "http://rubygems.org"
+
+gem "appraisal", "~> 2.1"
+gem "mocha", "~> 1.0", require: false
+gem "sqlite3"
+gem "rails", "5.2.2"
+gem "grape", "1.1.0"
+gem "rails-controller-testing"
+
+gemspec path: "../"